Re: [PATCH 0/3] FUTEX : new PRIVATE futexes, SMP and NUMA improvements

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From: Eric Dumazet

Subject: Re: [PATCH 0/3] FUTEX : new PRIVATE futexes, SMP and NUMA improvements

Date: Friday, March 16, 2007 - 3:30 am

On Friday 16 March 2007 11:10, Peter Zijlstra wrote:

quoted text> http://programming.kicks-ass.net/kernel-patches/futex-vma-cache/vma_cache.p
>atch

Oh thanks

quoted text>
> > But if it has to walk the vmas (and take mmap_sem), you already loose the
> > PRIVATE benefit.
>
> It doesn't take mmap_sem, I am aware of the problems.

Yes but the vma_anon() -> vma_cache_find() needs to read 3 cache lines on 
x86_64 (sizeof(struct vma_cache) = 136)
and dirty one bit, so it might be more expensive than the mmap_sem ...

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Messages in current thread:

[PATCH 0/3] FUTEX : new PRIVATE futexes, SMP and NUMA impr ..., Eric Dumazet, (Thu Mar 15, 12:10 pm)

Re: [PATCH 0/3] FUTEX : new PRIVATE futexes, SMP and NUMA ..., Nick Piggin, (Thu Mar 15, 1:15 pm)

Re: [PATCH 0/3] FUTEX : new PRIVATE futexes, SMP and NUMA ..., Peter Zijlstra, (Fri Mar 16, 1:05 am)

Re: [PATCH 0/3] FUTEX : new PRIVATE futexes, SMP and NUMA ..., Eric Dumazet, (Fri Mar 16, 2:30 am)

Re: [PATCH 0/3] FUTEX : new PRIVATE futexes, SMP and NUMA ..., Peter Zijlstra, (Fri Mar 16, 3:10 am)

Re: [PATCH 0/3] FUTEX : new PRIVATE futexes, SMP and NUMA ..., Eric Dumazet, (Fri Mar 16, 3:30 am)

Re: [PATCH 0/3] FUTEX : new PRIVATE futexes, SMP and NUMA ..., Peter Zijlstra, (Fri Mar 16, 3:36 am)

Re: [PATCH 0/3] FUTEX : new PRIVATE futexes, SMP and NUMA ..., Ulrich Drepper, (Wed Apr 4, 12:16 am)

[PATCH] FUTEX : new PRIVATE futexes, Eric Dumazet, (Thu Apr 5, 10:49 am)

Re: [PATCH] FUTEX : new PRIVATE futexes, Ulrich Drepper, (Thu Apr 5, 1:43 pm)

Re: [PATCH] FUTEX : new PRIVATE futexes, Nick Piggin, (Thu Apr 5, 6:19 pm)

Re: [PATCH] FUTEX : new PRIVATE futexes, Eric Dumazet, (Thu Apr 5, 10:53 pm)

Re: [PATCH] FUTEX : new PRIVATE futexes, Hugh Dickins, (Thu Apr 5, 11:05 pm)

Re: [PATCH] FUTEX : new PRIVATE futexes, Nick Piggin, (Fri Apr 6, 4:50 am)

Shared futexes (was [PATCH] FUTEX : new PRIVATE futexes), Peter Zijlstra, (Fri Apr 6, 5:26 am)

Re: [PATCH] FUTEX : new PRIVATE futexes, Peter Zijlstra, (Fri Apr 6, 5:31 am)

Re: Shared futexes (was [PATCH] FUTEX : new PRIVATE futexes), Hugh Dickins, (Fri Apr 6, 6:02 am)

Re: Shared futexes (was [PATCH] FUTEX : new PRIVATE futexes), Peter Zijlstra, (Fri Apr 6, 6:15 am)

Re: Shared futexes (was [PATCH] FUTEX : new PRIVATE futexes), Nick Piggin, (Fri Apr 6, 6:15 am)

Re: Shared futexes (was [PATCH] FUTEX : new PRIVATE futexes), Peter Zijlstra, (Fri Apr 6, 6:22 am)

Re: Shared futexes (was [PATCH] FUTEX : new PRIVATE futexes), Nick Piggin, (Fri Apr 6, 6:40 am)

Re: [PATCH] FUTEX : new PRIVATE futexes, Jan Engelhardt, (Fri Apr 6, 10:41 am)

[PATCH, take4] FUTEX : new PRIVATE futexes, Eric Dumazet, (Sat Apr 7, 1:43 am)

Re: [PATCH, take4] FUTEX : new PRIVATE futexes, Nick Piggin, (Sat Apr 7, 2:30 am)

Re: [PATCH, take4] FUTEX : new PRIVATE futexes, Eric Dumazet, (Sat Apr 7, 3:00 am)

Re: [PATCH, take4] FUTEX : new PRIVATE futexes, Jakub Jelinek, (Sat Apr 7, 4:18 am)

Re: [PATCH, take4] FUTEX : new PRIVATE futexes, Eric Dumazet, (Sat Apr 7, 4:54 am)

Re: [PATCH, take4] FUTEX : new PRIVATE futexes, Ulrich Drepper, (Sat Apr 7, 9:40 am)

Re: [PATCH, take4] FUTEX : new PRIVATE futexes, Andrew Morton, (Sat Apr 7, 3:15 pm)

Re: [PATCH, take4] FUTEX : new PRIVATE futexes, Eric Dumazet, (Tue Apr 10, 2:21 am)

Re: [PATCH, take4] FUTEX : new PRIVATE futexes, Nick Piggin, (Wed Apr 11, 12:22 am)

Re: [PATCH, take4] FUTEX : new PRIVATE futexes, Eric Dumazet, (Wed Apr 11, 1:14 am)

[PATCH, take5] FUTEX : new PRIVATE futexes, Eric Dumazet, (Wed Apr 11, 2:19 am)

Re: [PATCH, take4] FUTEX : new PRIVATE futexes, Nick Piggin, (Wed Apr 11, 2:23 am)

Re: [PATCH, take4] FUTEX : new PRIVATE futexes, Pierre Peiffer, (Wed Apr 11, 2:30 am)

Re: [PATCH, take4] FUTEX : new PRIVATE futexes, Eric Dumazet, (Wed Apr 11, 2:35 am)

Re: [PATCH, take4] FUTEX : new PRIVATE futexes, Nick Piggin, (Wed Apr 11, 2:39 am)

Re: [PATCH, take4] FUTEX : new PRIVATE futexes, Nick Piggin, (Wed Apr 11, 2:40 am)

Re: [PATCH, take5] FUTEX : new PRIVATE futexes, Rusty Russell, (Wed Apr 11, 5:23 am)

Re: [PATCH, take4] FUTEX : new PRIVATE futexes, Nick Piggin, (Wed Apr 11, 6:57 pm)

[PATCH, take6] FUTEX : new PRIVATE futexes, Eric Dumazet, (Thu Apr 26, 5:55 am)

Re: [PATCH, take6] FUTEX : new PRIVATE futexes, Pierre Peiffer, (Thu Apr 26, 6:35 am)